Jul, 10 2022585 Views Our 20 foot steel cargo shipping and storage containers have an outside dimension of 20 x 8 x 8.6, making them an excellent choice for portable onsite storage. Our 20 Containers feature:. Frames constructed from 8 gauge steel. Body construction of 14 gauge steel. One-inch thick wood floors. Our containers are an ideal choice for short term or long term storage space. These are suitable for building supplies, commercial use, home use and much more. Our containers offer secure storage too. Steel Works(720) 432-7294Havana, FLStorage Units